UltraLLaDA: Scaling the Context Length to 128K for Diffusion Large Language Models - He, Guangxin; Nie, Shen; Zhu, Fengqi; Zhao, Yuankang; Bai, Tianyi; Yan, Ran; Fu, Jie; Li, Chongxuan; Yuan, Binhang (International Conference on Learning Representations, 2026)